What barrel lengths did the round butt versions commonly come with? I'm interested in picking one of these up, especially an early pinned version if possible, but I prefer the round over the square butt.
Naval Intelligence agents got some round-butt four-inch M-19's. I think some wound up at the FBI.
This would have been a good general option, but not one that S&W made available.
There may have been other special orders that we don't know about. Cops who wanted a gun suited for both uniform carry and for plainclothes would surely see the advantage in a round butt and four-inch bbl.